Wristwatch



FIG. 1 is a front view of my new and ornamental design for a wristwatch;

FIG. 2 is a right side elevation thereof;

FIG. 3 is a left side elevation thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a wristwatch, as shown and described. 